<template>
  <el-menu :default-active="activeMenu" mode="horizontal" :ellipsis="false" @select="handleSelect">
    <template v-for="(item, index) in topMenus">
      <el-menu-item v-if="index < Number(visibleNumber)" :key="index" :style="{ '--theme': theme }" :index="item.path"><svg-icon :icon-class="item.meta?.icon" /> {{ item.meta?.title }}</el-menu-item>
    </template>

    <!-- 顶部菜单超出数量折叠 -->
    <el-sub-menu v-if="topMenus.length > Number(visibleNumber)" :style="{ '--theme': theme }" index="more">
      <template #title>更多菜单</template>
      <template v-for="(item, index) in topMenus">
        <el-menu-item v-if="index >= Number(visibleNumber)" :key="index" :index="item.path"><svg-icon :icon-class="item.meta!.icon" /> {{ item.meta!.title }}</el-menu-item>
      </template>
    </el-sub-menu>
  </el-menu>
</template>

<script setup lang="ts">
  import { constantRoutes } from "@/router";
  import { isHttp } from "@/utils/validate";
  import useAppStore from "@/store/modules/app";
  import useSettingsStore from "@/store/modules/settings";
  import usePermissionStore from "@/store/modules/permission";
  import { ref, computed, onMounted, onBeforeUnmount } from "vue";
  import { RouteRecordRaw, useRoute, useRouter } from "vue-router";

  // 顶部栏初始数
  const visibleNumber = ref<number | null>(null);
  // 当前激活菜单的 index
  const currentIndex = ref(null);
  // 隐藏侧边栏路由
  const hideList = ["/index", "/user/profile"];

  const appStore = useAppStore();
  const settingsStore = useSettingsStore();
  const permissionStore = usePermissionStore();
  const route = useRoute();
  const router = useRouter();

  // 主题颜色
  const theme = computed(() => settingsStore.theme);
  // 所有的路由信息
  const routers = computed(() => permissionStore.topbarRouters);

  // 顶部显示菜单
  const topMenus = computed(() => {
    let topMenus: RouteRecordRaw[] = [];
    routers.value.map((menu) => {
      if (menu.hidden !== true) {
        // 兼容顶部栏一级菜单内部跳转
        if (menu.path === "/") {
          menu.children?.[0] && topMenus.push(menu.children?.[0]);
        } else {
          topMenus.push(menu);
        }
      }
    });
    return topMenus;
  });

  // 设置子路由
  const childrenMenus = computed(() => {
    let childrenMenus: RouteRecordRaw[] = [];
    routers.value.map((router) => {
      for (let item in router.children) {
        if (router.children[item as any].parentPath === undefined) {
          if (router.path === "/") {
            router.children[item as any].path = "/" + router.children[item as any].path;
          } else {
            if (!isHttp(router.children[item as any].path)) {
              router.children[item as any].path = router.path + "/" + router.children[item as any].path;
            }
          }
          router.children[item as any].parentPath = router.path;
        }
        childrenMenus.push(router.children[item as any]);
      }
    });
    return constantRoutes.concat(childrenMenus);
  });

  // 默认激活的菜单
  const activeMenu = computed(() => {
    const path = route.path;
    let activePath = path;
    if (path !== undefined && path.lastIndexOf("/") > 0 && hideList.indexOf(path) === -1) {
      const tmpPath = path.substring(1, path.length);
      activePath = "/" + tmpPath.substring(0, tmpPath.indexOf("/"));
      if (!route.meta.link) {
        appStore.toggleSideBarHide(false);
      }
    } else if (!(route as any).children) {
      activePath = path;
      appStore.toggleSideBarHide(true);
    }
    activeRoutes(activePath);
    return activePath;
  });

  function setVisibleNumber() {
    const width = document.body.getBoundingClientRect().width / 3;
    visibleNumber.value = parseInt(String(width / 85));
  }

  function handleSelect(key: any, keyPath: any) {
    currentIndex.value = key;
    const route = routers.value.find((item) => item.path === key);
    if (isHttp(key)) {
      // http(s):// 路径新窗口打开
      window.open(key, "_blank");
    } else if (!route || !route.children) {
      // 没有子路由路径内部打开
      router.push({ path: key });
      appStore.toggleSideBarHide(true);
    } else {
      // 显示左侧联动菜单
      activeRoutes(key);
      appStore.toggleSideBarHide(false);
    }
  }
  function activeRoutes(key: any) {
    let routes: RouteRecordRaw[] = [];
    if (childrenMenus.value && childrenMenus.value.length > 0) {
      childrenMenus.value.map((item) => {
        if (key === item.parentPath || (key === "index" && "" === item.path)) {
          routes.push(item);
        }
      });
    }
    if (routes.length > 0) {
      permissionStore.setSidebarRouters(routes);
    } else {
      appStore.toggleSideBarHide(true);
    }
    return routes;
  }

  onMounted(() => {
    window.addEventListener("resize", setVisibleNumber);
  });
  onBeforeUnmount(() => {
    window.removeEventListener("resize", setVisibleNumber);
  });

  onMounted(() => {
    setVisibleNumber();
  });
</script>

<style lang="scss">
  .topmenu-container.el-menu--horizontal > .el-menu-item {
    float: left;
    height: 50px !important;
    line-height: 50px !important;
    color: #999093 !important;
    padding: 0 5px !important;
    margin: 0 10px !important;
  }

  .topmenu-container.el-menu--horizontal > .el-menu-item.is-active,
  .el-menu--horizontal > .el-sub-menu.is-active .el-submenu__title {
    border-bottom: 2px solid #{"var(--theme)"} !important;
    color: #303133;
  }

  /* sub-menu item */
  .topmenu-container.el-menu--horizontal > .el-sub-menu .el-sub-menu__title {
    float: left;
    height: 50px !important;
    line-height: 50px !important;
    color: #999093 !important;
    padding: 0 5px !important;
    margin: 0 10px !important;
  }
</style>
